package com.sfac.javaSpringBoot.modules.common.controller;

import com.sfac.javaSpringBoot.modules.common.entity.ExceptionLog;
import com.sfac.javaSpringBoot.modules.common.service.ExceptionLogService;
import org.apache.commons.lang3.StringUtils;
import org.apache.shiro.authz.UnauthorizedException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.json.MappingJackson2JsonView;

import javax.servlet.http.HttpServletRequest;
import java.rmi.UnexpectedException;

@ControllerAdvice
public class ExceptionHandleController {
    private final static Logger LOGGER =
            LoggerFactory.getLogger(ExceptionHandleController.class);
    @Autowired
    private ExceptionLogService exceptionLogService;

//    @ExceptionHandler(value = {ArithmeticException.class})
    @ExceptionHandler(value = {Exception.class})
    public ModelAndView exceptionHandle(HttpServletRequest request, Exception e) {
        LOGGER.debug("==== Catch Exception ====");
        LOGGER.debug(e.getMessage());
        e.printStackTrace();

        // 根据异常的类型确定状态值、错误路径、错误信息 ---- 403 || 500
        HttpStatus httpStatus = HttpStatus.INTERNAL_SERVER_ERROR;
        String errorPath = "/common/500";
        String message = "Internal Server Error.";
        // 先假定 ArithmeticException 是没有权限异常
        if (e instanceof UnauthorizedException) {
            httpStatus = HttpStatus.FORBIDDEN;
            errorPath = "/common/403";
            message = "No permission.";
        }

        // 保存异常信息
        saveExceptionLog(request, e);

        // 判断访问是 view 还是数据接口
        if (isInterface(request)) {
            // 返回 json 数据
            return returnJson(errorPath, httpStatus, message);
        } else {
            // 返回错误页面
            return returnView(errorPath, httpStatus);
        }
    }

    // 返回 json
    private ModelAndView returnJson(String path, HttpStatus httpStatus, String message) {
        ModelAndView modelAndView = new ModelAndView(new MappingJackson2JsonView());
        modelAndView.addObject("status", httpStatus.value());
        modelAndView.addObject("message", message);
        modelAndView.addObject("object", path);
        return modelAndView;
    }

    // 返回 view
    private ModelAndView returnView(String path, HttpStatus httpStatus) {
        return new ModelAndView("redirect:" + path, httpStatus);
    }

    // 判断是否为接口
    private boolean isInterface(HttpServletRequest request) {
        HandlerMethod HandlerMethod = (HandlerMethod)request.getAttribute(
                "org.springframework.web.servlet.HandlerMapping.bestMatchingHandler");
        if (HandlerMethod == null) {
            return false;
        }
        ResponseBody[] methodAnnotations =
                HandlerMethod.getMethod().getAnnotationsByType(ResponseBody.class);
        ResponseBody[] typeAnnotations1 =
                HandlerMethod.getBeanType().getAnnotationsByType(ResponseBody.class);
        RestController[] typeAnnotations2 =
                HandlerMethod.getBeanType().getAnnotationsByType(RestController.class);
        return methodAnnotations.length > 0 ||
                typeAnnotations1.length > 0 ||
                typeAnnotations2.length > 0;
    }

    // 保存异常信息
    private void saveExceptionLog(HttpServletRequest request, Exception e) {
        ExceptionLog exceptionLog = new ExceptionLog();
        exceptionLog.setIp(request.getRemoteAddr());
        exceptionLog.setPath(request.getRequestURI());
        HandlerMethod HandlerMethod = (HandlerMethod)request.getAttribute(
                "org.springframework.web.servlet.HandlerMapping.bestMatchingHandler");
        if (HandlerMethod != null) {
            exceptionLog.setClassName(HandlerMethod.getBeanType().getName());
            exceptionLog.setMethodName(HandlerMethod.getMethod().getName());
        }
        exceptionLog.setExceptionType(e.getClass().getSimpleName());
        exceptionLog.setExceptionMessage(StringUtils.isBlank(e.getMessage()) ? "" :
                e.getMessage().substring(0,
                        e.getMessage().length() > 200 ? 200 : e.getMessage().length()));

        exceptionLogService.insertExceptionLog(exceptionLog);
    }
}
